org.apache.druid.sql.calcite.rel

Class DruidQueryRel

java.lang.Object

org.apache.calcite.rel.AbstractRelNode

org.apache.druid.sql.calcite.rel.DruidRel<DruidQueryRel>

org.apache.druid.sql.calcite.rel.DruidQueryRel

All Implemented Interfaces:

Cloneable, org.apache.calcite.plan.RelOptNode, org.apache.calcite.rel.RelNode

public class DruidQueryRel
extends DruidRel<DruidQueryRel>

DruidRel that uses a "table" dataSource.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.calcite.rel.RelNode

org.apache.calcite.rel.RelNode.Context

Field Summary

Fields inherited from class org.apache.calcite.rel.AbstractRelNode

digest, id, rowType, traitSet

Method Summary

Modifier and Type	Method and Description
DruidQueryRel	asDruidConvention()
org.apache.calcite.plan.RelOptCost	computeSelfCost(org.apache.calcite.plan.RelOptPlanner planner, org.apache.calcite.rel.metadata.RelMetadataQuery mq)
protected org.apache.calcite.rel.type.RelDataType	deriveRowType()
org.apache.calcite.rel.RelWriter	explainTerms(org.apache.calcite.rel.RelWriter pw)
static DruidQueryRel	fullScan(org.apache.calcite.rel.logical.LogicalTableScan scanRel, org.apache.calcite.plan.RelOptTable table, DruidTable druidTable, QueryMaker queryMaker) Create a DruidQueryRel representing a full scan.
List<String>	getDataSourceNames() Get a list of names of datasources read by this DruidRel
PartialDruidQuery	getPartialDruidQuery() Returns the PartialDruidQuery associated with this DruidRel, and which can be built on top of.
int	getQueryCount() Return the number of Druid queries this rel involves, including sub-queries.
org.apache.calcite.plan.RelOptTable	getTable()
Sequence<Object[]>	runQuery()
DruidQuery	toDruidQuery(boolean finalizeAggregations) Convert this DruidRel to a DruidQuery.
DruidQuery	toDruidQueryForExplaining() Convert this DruidRel to a DruidQuery for purposes of explaining.
DruidQueryRel	withPartialQuery(PartialDruidQuery newQueryBuilder)

Methods inherited from class org.apache.druid.sql.calcite.rel.DruidRel

getPlannerContext, getQueryMaker, isValidDruidQuery

Methods inherited from class org.apache.calcite.rel.AbstractRelNode

accept, accept, childrenAccept, collectVariablesSet, collectVariablesUsed, computeDigest, computeSelfCost, copy, equals, estimateRowCount, explain, getChildExps, getCluster, getCollationList, getConvention, getCorrelVariable, getDescription, getDigest, getExpectedInputRowType, getId, getInput, getInputs, getQuery, getRelTypeName, getRows, getRowType, getTraitSet, getVariablesSet, getVariablesStopped, hashCode, isDistinct, isKey, isValid, isValid, metadata, onRegister, recomputeDigest, register, replaceInput, sole, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

fullScan

public static DruidQueryRel fullScan(org.apache.calcite.rel.logical.LogicalTableScan scanRel,
                                     org.apache.calcite.plan.RelOptTable table,
                                     DruidTable druidTable,
                                     QueryMaker queryMaker)

Create a DruidQueryRel representing a full scan.

toDruidQuery

@Nonnull
public DruidQuery toDruidQuery(boolean finalizeAggregations)

Description copied from class: DruidRel

Convert this DruidRel to a DruidQuery. This may be an expensive operation. For example, DruidSemiJoin needs to execute the right-hand side query in order to complete this method. This method may return null if it knows that this rel will yield an empty result set.

Specified by:

toDruidQuery in class DruidRel<DruidQueryRel>

Parameters:

finalizeAggregations - true if this query should include explicit finalization for all of its aggregators, where required. Useful for subqueries where Druid's native query layer does not do this automatically.

Returns:

query, or null if it is known in advance that this rel will yield an empty result set.

toDruidQueryForExplaining

public DruidQuery toDruidQueryForExplaining()

Description copied from class: DruidRel

Convert this DruidRel to a DruidQuery for purposes of explaining. This must be an inexpensive operation. For example, DruidSemiJoin will use a dummy dataSource in order to complete this method, rather than executing the right-hand side query. This method may not return null.

Specified by:

toDruidQueryForExplaining in class DruidRel<DruidQueryRel>

Returns:

query

asDruidConvention

public DruidQueryRel asDruidConvention()

Specified by:

asDruidConvention in class DruidRel<DruidQueryRel>

getDataSourceNames

public List<String> getDataSourceNames()

Description copied from class: DruidRel

Get a list of names of datasources read by this DruidRel

Specified by:

getDataSourceNames in class DruidRel<DruidQueryRel>

getPartialDruidQuery

public PartialDruidQuery getPartialDruidQuery()

Description copied from class: DruidRel

Returns the PartialDruidQuery associated with this DruidRel, and which can be built on top of. Returns null if this rel cannot be built on top of.

Specified by:

getPartialDruidQuery in class DruidRel<DruidQueryRel>

withPartialQuery

public DruidQueryRel withPartialQuery(PartialDruidQuery newQueryBuilder)

Specified by:

withPartialQuery in class DruidRel<DruidQueryRel>

getQueryCount

public int getQueryCount()

Description copied from class: DruidRel

Return the number of Druid queries this rel involves, including sub-queries. Simple queries will return 1.

Specified by:

getQueryCount in class DruidRel<DruidQueryRel>

Returns:

number of nested queries

runQuery

public Sequence<Object[]> runQuery()

Specified by:

runQuery in class DruidRel<DruidQueryRel>

getTable

public org.apache.calcite.plan.RelOptTable getTable()

Specified by:

getTable in interface org.apache.calcite.rel.RelNode

Overrides:

getTable in class org.apache.calcite.rel.AbstractRelNode

deriveRowType

protected org.apache.calcite.rel.type.RelDataType deriveRowType()

Overrides:

deriveRowType in class org.apache.calcite.rel.AbstractRelNode

explainTerms

public org.apache.calcite.rel.RelWriter explainTerms(org.apache.calcite.rel.RelWriter pw)

Overrides:

explainTerms in class org.apache.calcite.rel.AbstractRelNode

computeSelfCost

public org.apache.calcite.plan.RelOptCost computeSelfCost(org.apache.calcite.plan.RelOptPlanner planner,
                                                          org.apache.calcite.rel.metadata.RelMetadataQuery mq)

Specified by:

computeSelfCost in interface org.apache.calcite.rel.RelNode

Overrides:

computeSelfCost in class org.apache.calcite.rel.AbstractRelNode